JP2001297509A - Turntable and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turntable of simple structure with which eccentricity of a disk-like information recording medium can be surely corrected when the disk-like information recording medium is mounted on the turntable, and of which the cost is reduced, and an optical device. SOLUTION: The turntable is provided with a fixing part 48 inserted in an inner periphery edge forming the center hole of the disk-like information recording medium D, a moving part 50 for correcting the eccentricity generated when mounting the disk-like information recording medium D by being inserted in the inner periphery edge and elastically deforming based on the fixing part 48, a shaft part 42 formed integrally with the fixing part 48, into which a shaft 14A of a motor for performing continuous rotation of the turntable 12 is inserted, and a restoration member 60 of the moving part which restores the moving part 50 from a position for mounting of the disk-like information recording medium D to a position for un-mounting of the disk-like information recording medium D, when the disk-like information recording medium D is not mounted. The restoration member 60 of the moving part is directly fixed to the shaft part 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable for mounting and continuously rotating a disc-shaped information recording medium and an optical disc apparatus having the turntable.

[0002]

2. Description of the Related Art A disc-shaped information recording medium (hereinafter referred to as a disc) is, for example, a compact disc (CD).
And DVD (digital versatile disk, digital video disk, digital versatile disk) and the like.
This type of optical disc is detachably held on a turntable. FIG. 21 shows a conventional turntable. The turntable 1000 detachably holds the optical disc D. Center hole 1001 of optical disk D
Is the centering part 100 of the turntable 1000
It is detachably held by being fitted into the second fixed portion 1003 and the movable claw 1004. Fixed part 1003
Has a function of positioning the optical disk D, and a movable claw 1004 for mounting the optical disk D in alignment with the center line CL of the turntable 1000 when the optical disk D is eccentric.

[0003] The centering portion 1002 is a magnet 1
The magnet 1004 magnetically attracts a chucking portion (not shown) to hold the optical disc D on the turntable 1000. A yoke 1005 is provided below the magnet 1004.
Centering part 10 for turntable 1000
02 is fixed by press fitting. Turntable 10
00 is attached to the shaft 1007 of the motor 1006 by press fitting. The movable claw 1004 is a PEI that is unlikely to cause a creep phenomenon in order to prevent the creep phenomenon from occurring when the optical disc D is mounted and not returning to the original state.
A creepless material such as (polyetherimide) is used.

[0004]

However, since such a movable claw 1004 for centering is made of a creepless material, this creepless material is expensive. Even if is provided integrally with the centering portion 1002, a problem occurs in terms of rigidity. The turntable 1000 is a motor 10
Since the center ring portion 1002 is press-fitted into the turntable 1000 and the center ring portion 1002 is press-fitted into the shaft 1007, it is difficult to obtain assembly accuracy for preventing the center ring portion 1002 from causing the shaft 1007 to run out. Moreover, the centering part 1002 and the turntable 1000
Is a separate member, so that an increase in cost cannot be avoided.

Accordingly, the present invention has solved the above-mentioned problems, and has a simple and cost-effective structure capable of reliably correcting the eccentricity of a disk-shaped information recording medium when the disk-shaped information recording medium is mounted on a turntable. It is an object of the present invention to provide a turntable and an optical disk device that can be downed.

[0006]

According to the first aspect of the present invention, a center hole of the disc-shaped information recording medium is formed in a turntable for mounting and continuously rotating the disc-shaped information recording medium. A fixed portion fitted into the inner peripheral edge, a movable portion for correcting eccentricity when the disc-shaped information recording medium is mounted by being elastically deformed by being fitted into the inner peripheral edge with reference to the fixed portion; A shaft part, which is formed integrally with a fixed part, into which a shaft of a motor for continuously rotating the turntable is inserted, and the movable part, which is not mounted on the disk-shaped information recording medium, has a disk shape. A return member of a movable section for returning from a position where the information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted, and a return section of the movable section. Is a turntable, characterized in that it is directly fixed to the shaft portion.

According to the first aspect, the fixed portion is fitted on the inner peripheral surface of the disc-shaped information recording medium which forms the center hole. The movable section corrects eccentricity when a disc-shaped information recording medium is mounted. The return member of the movable portion returns the movable portion from the position where the disk-shaped information recording medium is mounted to the position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. It has a function to make it work. Thereby, when the disk-shaped information recording medium is mounted on the turntable, the movable portion can correct the eccentricity of the disk-shaped information recording medium. In addition, the return member of the movable section can return the movable section from the position where the disc-shaped information recording medium is mounted to the position where the disc-shaped information recording medium is not mounted. Thus, the movable portion can surely correct the eccentricity when the disc-shaped information recording medium is mounted. With the movable member returning member, the portion including the movable portion does not need to use the material of the creepless material for preventing the creep phenomenon unlike the related art, and can use a usual resin, for example. For this reason, since a special material such as a creepless material is not used, the cost can be reduced.
Moreover, since the return member of the movable portion is directly fixed to the shaft portion, there is no need for a special portion to fix the return member of the movable portion. Can be fixed. Thus, the structure is simple and the cost can be reduced.

According to a second aspect of the present invention, in the turntable according to the first aspect, the movable portion is a claw-shaped member,
Plural pieces are arranged at equal angles around the rotation center axis. According to the second aspect, since the plurality of movable parts are arranged at equal angles about the rotation center axis,
Each movable part can surely correct the eccentricity of the disc-shaped information recording medium at any position.

According to a third aspect of the present invention, in the turntable according to the first aspect, a member for chucking the disk-shaped information recording medium and a magnet for magnetically attracting the member for chucking are provided. The disc-shaped information recording medium is detachably held between the magnet and the member for chucking. According to the third aspect, the magnet of the turntable can detachably hold the disc-shaped information recording medium by sucking the member of the chucking member.

According to a fourth aspect of the present invention, in a turntable for mounting and continuously rotating a disc-shaped information recording medium, the disc-shaped information recording medium is fixed to an inner peripheral edge of the disc-shaped information recording medium forming a center hole. A movable portion for correcting eccentricity when the disc-shaped information recording medium is mounted by being fitted into the inner peripheral edge with respect to the fixed portion and elastically deforming, and the disc-shaped information recording medium And a return member of a movable unit that returns the movable unit from a position where the disc-shaped information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted when the disc-shaped information recording medium is not mounted. The fixed portion has a hole for fitting a shaft of a motor for continuously rotating the turntable, and the return member of the movable portion is directly connected to the shaft of the motor. It is fixed is a turntable and said.

According to a fourth aspect of the present invention, the fixed portion is fitted on the inner peripheral surface of the disc-shaped information recording medium which forms the center hole. The movable section corrects eccentricity when a disc-shaped information recording medium is mounted. The return member of the movable portion returns the movable portion from the position where the disk-shaped information recording medium is mounted to the position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. It has a function to make it work. Thereby, when the disk-shaped information recording medium is mounted on the turntable, the movable portion can correct the eccentricity of the disk-shaped information recording medium. In addition, the return member of the movable section can return the movable section from the position where the disc-shaped information recording medium is mounted to the position where the disc-shaped information recording medium is not mounted. Thus, the movable portion can surely correct the eccentricity when the disc-shaped information recording medium is mounted. With the movable member returning member, the portion including the movable portion does not need to use the material of the creepless material for preventing the creep phenomenon unlike the related art, and can use a usual resin, for example. For this reason, since a special material such as a creepless material is not used, the cost can be reduced.
Further, the fixed portion has a hole for fitting the shaft of the motor, and the return member of the movable portion can be directly fixed to the shaft of the motor. Thus, the return member of the movable portion can be directly fixed to the shaft without preparing a special portion, so that the structure can be simplified and the cost can be reduced.

According to a fifth aspect of the present invention, in the turntable according to the fourth aspect, the movable portion is a claw-shaped member,
Plural pieces are arranged at equal angles around the rotation center axis. In claim 5, a plurality of movable parts are arranged at equal angles around the rotation center axis.
Each movable part can surely correct the eccentricity of the disc-shaped information recording medium at any position.

According to a sixth aspect of the present invention, in the turntable according to the fourth aspect, there is provided a member for chucking the disk-shaped information recording medium, and a magnet for magnetically attracting the member for chucking. The disc-shaped information recording medium is detachably held between the magnet and the member for chucking. According to the sixth aspect, the magnet of the turntable can detachably hold the disc-shaped information recording medium by attracting the chucking member.

According to a seventh aspect of the present invention, there is provided an optical disc apparatus having a turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein the turntable forms a center hole of the disc-shaped information recording medium. A fixed part fitted to the inner peripheral edge, and a movable part for correcting eccentricity when the disc-shaped information recording medium is mounted by being elastically deformed by being fitted to the inner peripheral edge with reference to the fixed part. And a shaft part integrally formed with the fixed part, into which a shaft of a motor for continuously rotating the turntable is inserted, and the movable part when the disc-shaped information recording medium is not mounted. A return member of a movable unit that returns from a position when the disc-shaped information recording medium is mounted to a position when the disc-shaped information recording medium is not mounted; Comprising a return member of the movable part is a disc apparatus having a turntable, characterized in that it is directly fixed to the shaft portion.

According to the seventh aspect, the fixing portion is fitted on the inner peripheral surface of the disc-shaped information recording medium which forms the center hole. The movable section corrects eccentricity when a disc-shaped information recording medium is mounted. The return member of the movable portion returns the movable portion from the position where the disk-shaped information recording medium is mounted to the position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. It has a function to make it work. Thereby, when the disk-shaped information recording medium is mounted on the turntable, the movable portion can correct the eccentricity of the disk-shaped information recording medium. In addition, the return member of the movable section can return the movable section from the position where the disc-shaped information recording medium is mounted to the position where the disc-shaped information recording medium is not mounted. Thus, the movable portion can surely correct the eccentricity when the disc-shaped information recording medium is mounted. With the movable member returning member, the portion including the movable portion does not need to use the material of the creepless material for preventing the creep phenomenon unlike the related art, and can use a usual resin, for example. For this reason, since a special material such as a creepless material is not used, the cost can be reduced.
Moreover, since the return member of the movable portion is directly fixed to the shaft portion, there is no need for a special portion to fix the return member of the movable portion. Can be fixed. Thus, the structure is simple and the cost can be reduced.

According to an eighth aspect of the present invention, in the optical disk device having the turntable according to the seventh aspect, the movable portion is a claw-shaped member, and a plurality of the movable portions are arranged at an equal angle about the rotation center axis. ing. According to the eighth aspect, since a plurality of movable parts are arranged at equal angles about the rotation center axis, each movable part can surely correct the eccentricity of the disc-shaped information recording medium at any position. Can be.

According to a ninth aspect of the present invention, in the optical disk device having the turntable according to the seventh aspect, a member for chucking the disk-shaped information recording medium;
There is a magnet for magnetically attracting the chucking member, and the disc-shaped information recording medium is detachably held between the magnet and the chucking member. According to the ninth aspect, the magnet of the turntable can detachably hold the disc-shaped information recording medium by attracting the member of the chucking member.

According to a tenth aspect of the present invention, there is provided an optical disc apparatus having a turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein the turntable forms a center hole of the disc-shaped information recording medium. A fixed part fitted to the inner peripheral edge, and a movable part for correcting eccentricity when the disc-shaped information recording medium is mounted by being elastically deformed by being fitted to the inner peripheral edge with reference to the fixed part. When the disc-shaped information recording medium is not mounted, the movable section is returned from a position where the disc-shaped information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted. A return member for a movable portion, wherein the fixed portion has a hole for fitting a shaft of a motor for continuously rotating the turntable. Return member of the movable portion is an optical disc apparatus having a turntable, characterized in that it is fixed directly to the shaft of the motor.

In the tenth aspect, the fixing portion is fitted on the inner peripheral surface forming the center hole of the disc-shaped information recording medium. The movable section corrects eccentricity when a disc-shaped information recording medium is mounted. The return member of the movable portion returns the movable portion from the position where the disk-shaped information recording medium is mounted to the position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. It has a function to make it work. Thereby, when the disk-shaped information recording medium is mounted on the turntable, the movable portion can correct the eccentricity of the disk-shaped information recording medium. In addition, the return member of the movable section can return the movable section from the position where the disc-shaped information recording medium is mounted to the position where the disc-shaped information recording medium is not mounted. Thus, the movable portion can surely correct the eccentricity when the disc-shaped information recording medium is mounted. With the movable member returning member, the portion including the movable portion does not need to use the material of the creepless material for preventing the creep phenomenon unlike the related art, and can use a usual resin, for example. For this reason, since a special material such as a creepless material is not used, the cost can be reduced.
Further, the fixed portion has a hole for fitting the shaft of the motor, and the return member of the movable portion can be directly fixed to the shaft of the motor. Thus, the return member of the movable portion can be directly fixed to the shaft without preparing a special portion, so that the structure can be simplified and the cost can be reduced.

According to an eleventh aspect of the present invention, in the optical disk device having the turntable according to the tenth aspect, the movable portion is a claw-shaped member, and a plurality of the movable portions are arranged at an equal angle about the rotation center axis. ing. According to the eleventh aspect, since a plurality of movable parts are arranged at equal angles around the rotation center axis, each movable part can surely correct the eccentricity of the disc-shaped information recording medium at any position. Can be.

According to a twelfth aspect of the present invention, in the optical disk device having the turntable according to the tenth aspect, a member for chucking the disk-shaped information recording medium and a member for chucking the chucking are magnetically attracted. And the disk-shaped information recording medium,
It is detachably held between the magnet and the member for chucking. According to the twelfth aspect, the magnet of the turntable can detachably hold the disc-shaped information recording medium by attracting the member of the chucking member.

[0022]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows a preferred embodiment of the optical disk apparatus of the present invention. The optical disk device 10 is also called a disk device, and has a turntable 12. The turntable 12 rotates continuously by the operation of the motor 14. The turntable 12 detachably holds a disk-shaped information recording medium (hereinafter referred to as an optical disk or a disk) D such as a compact disk or a DVD, and rotates the information recording medium continuously. Although the illustration of the housing of the optical disk device 10 is omitted, a base member 16 is housed in the housing. The base member 16 has a mechanism section 22 that can move and position the optical pickup 20 in the X direction. This mechanism 22
The driving force of the motor 24 is controlled by a plurality of gears 26, 28, 3
The rack 34 can be moved in the X direction or the X1 direction, which is the opposite direction, via the 0 and 32. The movement of the rack 34 causes the optical pickup 20 to move in the X direction or X1 direction.
To move in the direction.

The optical pickup 20 includes the turntable 1
The information recorded on the optical disk D is optically read by, for example, irradiating the reading surface of the optical disk D mounted on the optical disk 2 with a laser beam, or the information is read onto the optical disk D by a laser beam as necessary. Has the ability to write. The optical pickup 20 may be a read-only optical unit that only reads information on the optical disk D as described above, or an optical disk for recording and reproduction that can read information and write information on the optical disk D in reverse. Of course.

FIGS. 2 and 3 show the optical disk drive 10 of FIG.
Of the turntable 12 is shown. The turntable 12 has a center ring portion 40 and a shaft portion 42, and the center ring portion 40 and the shaft portion 42 are integrally formed. For the centering portion 40 and the shaft portion 42, a material such as a normal resin such as polycarbonate can be used. The material of the centering portion 40 and the shaft portion 42 may be any material that does not demagnetize the magnetic force of the magnet 44. The centering section 40 of the turntable 12 has a receiving section 46, a fixed section 48, and a plurality of movable sections 50. The receiving portion 46, the fixed portion 48, and the movable portion 50 are integrally formed by integral molding. The centering portion 40 is integrated with the shaft portion 42 as described above, but the shaft portion 42 is formed to protrude in the axial direction. A hole 42A is formed at the center of the shaft portion 42 along the central axis CL.
The shaft 14A of the motor 14 is fixed by press fitting.

The magnet 44 shown in FIG. 2 is provided in the hole 40A of the center ring 40 by insert molding. The magnet 44 is located at the centering portion 40.
The reason why the insert molding can be performed is that the center ring portion 40 and the shaft portion 42 are not made of a special material which is a conventional creepless material, but are made of a normal resin material. Moreover, the centering part 40 and the shaft part 4
Since 2 does not demagnetize the magnetic force of the magnet 44, the magnet 44 can sufficiently exhibit its own magnetic force.

The chucking section 56 has a metal plate 58. The magnet 44 magnetically attracts the metal plate 58 of the chucking portion 56, and the boss 59 of the chucking portion 56 is fitted into the hole 40C of the centering portion 40, so that the chucking portion 56 turns the optical disc D. It can be chucked by pressing against the receiving portion 46 of the table 12.

As shown in FIGS. 3 to 5, the fixing portion 48 is a circular outer peripheral surface. This fixing portion 48 has a tapered tapered surface 48A. In the fixed part 48, for example, five movable parts 50 are formed at equal intervals. The fixed portion 48 is for fixing the inner peripheral edge 46 of the center hole H of the optical disc D in FIG. 2, and the plurality of movable portions 50 are elastically deformed in a cantilever type so that the optical disc D is correctly positioned at the center position. That is, it has a function of centering with respect to the rotation center axis CL with respect to the fixed portion 48 as a reference. For this reason, the movable portion 50 is also called a movable claw and has a function of elastically deforming.

The return member 60 of the movable portion also has a vibration-proof performance for suppressing vibration generated in the turntable 12.
The movable member return member 60 is located below the movable portion 50. When the optical disc D is mounted on the movable portion 50 as shown in FIG. Is elastically deformed in the R1 direction. However, when the optical disk D is removed from the turntable 12,
2 so that the movable member 50 returns to the normal state when the optical disk D shown in FIG. 3 is not mounted.
It has a function of forcibly returning in the direction of 2. Further, the return member 60 of the movable portion exerts an assisting force when centering the optical disc D. That is, the movable portion 50 formed by the mold needs the size EF and the shape shown in FIG. This shape corresponds to the mounting of the optical disk. Here, the movable section 50 is set to be larger by the radius a than the basic inner diameter of the optical disc. Here, in order to center the optical disk correctly, an imbalance is required unless the amount of force (multiple claw portions in this figure, five places) is required to bend the dimension a. Therefore, basically, this spring force mainly plays a role on the return member 60 side of the stable movable plate spring. The reason why the return member 60 of the leaf-shaped movable portion is stable is that the temperature characteristic is superior (stable) to the movable portion 50 made of resin. Since the return member 60 of the movable portion is flat, the shape thereof is made identical at a plurality of locations including accuracy, and variation (spring force) can be suppressed. Therefore, after the optical disk is removed, the movable section 50 is returned to the home position (corresponding to creep).
Not only that, it also plays a role in maintaining the balance of spring force (during centering).

The reason why the movable member return member 60 is provided is that, when the optical disk D is mounted on the turntable 12 as shown in FIG. This is because the movable portion 50 may not be able to return to the original state shown in FIG. 3 due to a creep phenomenon. If the movable portion 50 cannot return to the original state, the movable portion 50 cannot correct the eccentricity of the optical disc D, that is, cannot perform centering. Accordingly, the movable member return member 60 always returns the movable portion 50 in the direction of R2 shown in FIG. 3 when the optical disk D is removed. For this reason, the center ring portion 40 including the movable portion 50 can be made not by using a conventional expensive material having a creepless function but by using a normal inexpensive resin, for example, polycarbonate, thereby reducing costs. Can be. The center ring portion 40 of the turntable 12 can be made of ordinary resin or the like. For this purpose, the magnet 44
The center ring portion 40 and the shaft portion 42 may be formed by using an arbitrary resin material as long as the material does not demagnetize the magnetic force of the magnet 44. be able to.

FIG. 3 is an exploded perspective view of the turntable 12. The return member 60 of the movable portion is made of, for example, stainless steel for spring (SUS301-CSP, SUS304-CS).
P) or phosphor bronze for spring (C5210P-1 / 2H), and the return member 60 of the movable portion is a so-called elastic member. The return member 60 of the movable portion is formed by punching, for example, a circular elastic member. The return member 60 of the movable portion includes a ring portion 61, a plurality of, for example, five support portions 62, and one detent portion. 63. The ring portion 61 has a hole 61A. The outer peripheral surface of the shaft portion 42 is fitted into the hole 61A. Thereby, the return member 60 of the movable portion can be securely and easily fixed to the shaft portion 42 while having a simple structure. However, the hole 61A has a plurality of small concave portions 61B as shown in FIG. The reason why the concave portion 61B is formed in this way is that the ring portion 61 can be securely held by elastic deformation (spring force) with respect to the outer peripheral portion of the shaft portion 42. If the length RL in the radial direction of the concave portion 61B is short, the peripheral portion of the concave portion 61B may be plastically deformed and the spring force may not work.

Around the ring portion 61, for example, five support portions 62 are formed so as to protrude in the radial direction. Each support portion 62 includes a movable portion 5 at a corresponding position.
It has a function of supporting the lower end of the “0” so as to be elastically deformable.
The support portion 62 is formed so as to project preferably at an equal angle to the ring portion 61. Each support portion 62 has a substantially T-shape. The detent part 63 is
One is formed between the adjacent support portions 62,62. The detent part 63 is fitted into the boss 100 of the fixed part 48 so that the return member 60 of the movable part
2, and has a function of positioning the return member 60 of the movable portion and the shaft portion 42 in the circumferential direction. FIG. 4 shows a state in which the rotation preventing portion 63 is fitted into the boss 100. With the boss 100 fitted in the rotation preventing portion 63 in this way, the movable member return member 60 supports the lower end of the movable portion 50. The boss 100 is melted as necessary, so that the detent portion 63
Is preferably welded.

FIG. 5 is a plan view of the turntable 12 of FIG. 4, and FIG. 6 is a bottom view of the turntable 12. FIG. 5 shows five movable parts 50 and a fixed part 48 and a receiving part 46, and FIG. 6 shows five movable parts 50 and the like.

When fixing the return member 60 of the movable portion to the shaft portion 42 as described above, the ring portion 6 shown in FIG.
It is desirable to fix the first hole 61A by press-fitting the outer peripheral surface of the shaft portion 42. However, in addition to this, the ring portion 61
Can be more sufficiently fixed using an adhesive. The above-mentioned movable member returning member 60 is used for the following reason. Due to the elastic supporting force of the movable member return member 60, when the optical disc D is not mounted, even if the movable portion 50 tries to maintain a state of bending in the R1 direction due to the creep phenomenon, the movable member return member 60 is not required. Can forcibly return the movable portion 50 in the direction of R2. FIG. 7 is a plan view of the return member 60 of the movable section in FIG. The return member of the movable portion is also called a spring retaining ring.

Next, an operation example of the optical disk device 10 shown in FIG. 1 having the above-described turntable 12 will be described. As shown in FIG. 3, a return member 60 of a movable portion as shown in FIG. 2 is fixed to the shaft 42 of the turntable 12. The movable member return member 60 pushes up the movable part 50.

In FIG. 2, the optical disk D is placed on the receiving portion 46 of the turntable 12, and the optical disk D is mounted. The outer diameter of each movable portion 50 is slightly larger than the standard value of the inner diameter of the center hole H of the optical disc D in advance, and in order to enable the movable portion 50 to center the optical disc D properly, 50
Is formed, the movable part 50 itself becomes the rotation center axis CL.
It is made not to be eccentric with respect to. Optical disk D
Using the five movable parts 50 and the fixed parts 48
8, the centering portion 40 of the turntable 12
The movable member 50 is elastically deformed in the R1 direction when it is mounted, so that the return member 60 of the movable member is elastically deformed temporarily. For example, when the movable unit 50 is left for a long time under a temperature condition or the like, the movable unit 50 may remain deformed.

However, when the optical disk D is not mounted, that is, when the optical disk D is removed, the movable portion 50 is released from the restraint of the optical disk D, so that the force with which the movable portion 50 abuts the return member 60 of the movable portion is reduced. The movable member returning member 60 forcibly returns or restores the movable portion 50 in the R2 direction.

As described above, when the optical disk D is not mounted, the position of the movable portion 50 is forcibly returned by the return member 60 of the movable portion. The centering is carried out accurately by the movable part 50, and it is mounted.

Next, FIG. 8 shows the turntable 12 shown in FIG.
A turntable 12 having a mode slightly different from that of the embodiment shown in FIG. In this turntable 12, the boss 100
Is formed slightly smaller than the boss 100 of FIG. Other elements of the turntable 12 of FIG. 8 are the same as those of the turntable of FIG.

9 to 11 show another embodiment of the turntable of the present invention. In the turntable 12 of FIG. 9, no boss is formed. The return member 160 of the movable portion shown in FIG. 10 or the return member 260 of the movable portion shown in FIG. 11 is fixed to the outer peripheral surface of the shaft portion 42 in FIG. The return member 160 of the movable portion in FIG. 10 has, for example, five support portions 62 which are formed so as to project in the radial direction at an equal angle with respect to the ring portion 61. Each support portion 62 has a substantially T-shape.

The return member 260 of the movable portion in FIG. 11 has, for example, five support portions 262. These support portions 262 have a substantially L-shape, and each support portion 2
62 has an extension 262A projecting in the radial direction and a portion 262B formed in the radial direction. The movable portion 50 in FIG. 9 is supported by the portion 262B in FIG. Portion 262A is formed radially at an equal angle from ring portion 261. For example, by changing the position where the movable portion 50 of FIG. 2 hits the portion 262B along the circumferential direction, the supporting force of the portion 262B supporting the movable portion 50 can be changed along the W direction with reference to the extension 262A. .

FIG. 12 and FIG. 13 show still another embodiment of the present invention. Turntable 1 shown in FIG.
2 has a boss 310. Return member 36 of movable part
0 indicates five support portions 362 as shown in FIG.
have. These support portions 362 are formed so as to protrude radially from the ring portion 361 at equal angles. A fitting portion 364 is formed between the adjacent support portions 362 and 362 so as to protrude in the radial direction. Each fit 364 has a hole 365. As shown in FIG. 12, the boss 310 is
5 are fitted respectively. The boss 310 fixes the fitting portion 364 by welding. The hole 361A of the ring portion 361 is fixed to the outer peripheral surface of the shaft portion 42 by press-fitting or press-fitting and bonding.

FIG. 14 shows still another embodiment of the present invention. FIG. 14 is an exploded perspective view including the turntable 12 and the motor, and FIG. 15 is an assembly view including the turntable and the motor. FIG. 16 is a plan view of the turntable, and FIG. 17 is a bottom view of the turntable. FIG. 18 is a plan view of the return member of the movable section.
In FIG. 14, the turntable 12 has a centering part 40, and the centering part 40 and the shaft 4
For 2, a material such as a normal resin such as polycarbonate can be used. The material of the centering portion 40 may be any material that does not demagnetize the magnetic force of the magnet 44.

Center ring 4 of turntable 12
0 has a receiving portion 46, a fixed portion 48, and a plurality of movable portions 50. The receiving portion 46, the fixed portion 48, and the movable portion 50 are integrally formed by integral molding. A hole 442A is formed at the center of the centering portion 40, and the shaft 14A of the motor 14 is fixed to the hole 442A by press fitting.

The magnet 44 shown in FIG. 14 and FIG.
The hole 40A of the center ring portion 40 is provided by insert molding. The reason that the magnet 44 can be insert-molded into the center ring portion 40 is that a special resin material, which is a conventional creepless material, is not used, but an ordinary resin material is used. Moreover, since the centering portion 40 does not demagnetize the magnetic force of the magnet 44, the magnet 44 can sufficiently exert its own magnetic force.

The chucking section 56 has a metal plate 58. The magnet 44 magnetically attracts the metal plate 58 of the chucking portion 56, and the boss 59 of the chucking portion 56 is fitted into the hole 40C of the centering portion 40, so that the chucking portion 56 turns the optical disc D. It can be chucked by pressing against the receiving portion 46 of the table 12.

FIG. 14 is an exploded perspective view showing the turntable 12, the movable member return member 460, and the motor 14. As shown in FIG. The fixing portion 48 is a circular outer peripheral surface. This fixing part 4
8 has a tapered tapered surface 48A. In the fixed part 48, for example, five movable parts 50 are formed at equal intervals. The fixed portion 48 fixes the inner peripheral edge of the center hole H of the optical disc D in FIG. 2, and the plurality of movable portions 50 are cantilevered and elastically deformed to correctly position the optical disc D at the center position, that is, It has a function of centering with respect to the rotation center axis CL. For this reason, the movable portion 50 is also called a movable claw and has a function of elastically deforming.

The movable portion 50 elastically deforms in the direction R1 when the optical disk D is mounted, and rebounds in the direction R2 when the optical disk D is not mounted. However, if the optical disc D is mounted for a long time,
0 may cause a creep decrease and may not return while deformed in the R1 direction. Due to the elastic supporting force of the movable member return member 460, even when the optical disk D is not mounted, even if the movable portion 50 causes a creep phenomenon and tries to maintain the bent state in the R1 direction, the movable member return member 460 does not.
Can forcibly return the movable portion 50 in the direction of R2.

The return member 4 of the movable portion shown in FIGS. 14 and 18
60 has a plurality of, for example, five support portions 462 and a ring portion 461. Hole 46 in ring portion 461
1A is fixed to the shaft 14A of the motor 14 by press fitting or by press fitting and bonding. Each support part 4
Reference numeral 62 has a substantially T-shape, and is formed so as to protrude radially at an equal angle. Two support parts 46
A detent part 463 is formed between the members 2, 462. The hole 463A of the detent portion 463 is fitted into the boss 400 of FIG. 15 and welded as necessary. As shown in FIG. 18, a plurality of recesses 461 are formed in the hole 461A.
B is formed. The reason why the concave portion 461B is formed in this way is to ensure that the ring portion 61 can be securely held against the outer peripheral portion of the shaft portion 42 by elastic deformation (spring force). If the length RL in the radial direction of the concave portion 61B is short, the peripheral portion of the concave portion 61B may be plastically deformed and the spring force may not work.

In the embodiments shown in FIGS. 14 to 18, the return member 460 of the movable portion is positioned with respect to the centering portion 40 in the rotational direction, and then the shaft 14A of the motor 14 is moved to the return member 460 of the movable portion. Of the center ring portion 40 and the return member 460 of the movable portion and the shaft 14A with a simple structure and simple work by press-fitting into the hole 461A of the center ring portion and the hole 442A of the center ring portion 40.
Can be integrated, so that the cost can be reduced.

The above-mentioned turntable is made of an integrally molded product, unlike the conventional one, so that the cost can be reduced and the creepless material, that is, a special expensive material without creep phenomenon, is used. Since it is made of a material that does not demagnetize the magnetic force of the magnet, such as
Material cost can be reduced.

The turntable has a plurality of fixed portions or fixed diameter portions corresponding to the center holes of the optical disk and a plurality of movable portions. The fixed portion (fixed diameter portion) is formed with an appropriate diameter while suppressing eccentricity with reference to the center hole of the turntable that fits with the motor shaft serving as the rotation center. However, in the case of mass production, there is a tolerance in the diameter of the center hole. Also, there is a tolerance in the center hole, and a variation (play) occurs between the turntable and the optical disk, which causes a problem as eccentricity of the optical disk. Therefore, in the present invention, a return member for the movable portion is provided to correct the problem. The movable part has a shape slightly larger than the diameter reference value of the center hole and the eccentricity is suppressed. As a result, the optical disk is centered when it is mounted on the turntable, and there is no play caused by only the fixed portion, and the eccentricity of the optical disk is corrected.

By adopting the embodiment of the present invention, in the mechanical portion for centering the optical disk, the movable portion for centering can use a normal turntable molding material, and the creep of the movable portion can be reduced. By adopting a return member of a movable portion directly fixed to a shaft portion of a turntable or a shaft of a motor to prevent the problem, it is possible to provide a low-cost and highly reliable turntable and an electronic device having the turntable. it can. When the optical disc is mounted for a long time, even if the movable section (claw section) is deformed due to creep, the movable section return member ensures that the movable section return member returns to the home position after the optical disc is removed. Has a function. The spring force of the return member of the movable portion also serves as an auxiliary force when centering the optical disk. That is, the movable portion 50 formed by the mold needs the size EF and the shape shown in FIG. This shape corresponds to the mounting of the optical disk. Here, the movable section 50 is set to be larger by the radius a than the basic inner diameter of the optical disc. Here, in order to center the optical disk correctly, an imbalance is required unless the amount of force (multiple claw portions in this figure, five places) is required to bend the dimension a. Therefore, basically, this spring force mainly plays a role on the return member 60 side of the stable movable plate spring.
The reason why the return member 60 of the leaf-shaped movable portion is stable is that the temperature characteristic is superior (stable) to the movable portion 50 made of resin. Since the return member 60 of the movable portion is flat, the shape thereof is made identical at a plurality of locations including accuracy, and variation (spring force) can be suppressed. Therefore, after the optical disk is removed, not only does the movable section 50 return to the home position (corresponding to creep), but also plays a role of maintaining the balance of spring force (during centering).

Since the return member of the movable portion can be basically formed in a flat shape, the dimensional accuracy and the spring force are stable, and the operation reliability when returning the movable portion is high. Since it has the movable portion and the return member of the movable portion, a bias force applied in the radial direction of the optical disk can be obtained appropriately, and the turntable is excellent in vibration resistance. Conventionally, the turntable is simply press-fitted into the motor shaft, but in the embodiment of the present invention, the turntable and the return member of the movable portion are press-fitted into the motor shaft. Thereby, the return member of the movable portion plays a role of a snap ring with respect to the shaft, and thus the load resistance of the turntable is improved. FIG. 20 as an example
As shown in (A) and (B), in the case where the return member 60 of the movable portion is press-fitted to the shaft 14A side of the motor 14, the press-fitting allowance for the shaft 14A in the turntable cannot be so large. As shown in FIG. 20A, when the re-press input of the turntable 12 is F1 (N) and the re-press input of the return member 60 is F2 (N), the re-press input F in a form in which both parts are combined. Becomes F = F1 + F2 as shown in FIG. (Re-press input refers to withstand load.) Even if the press-fit allowance of the turntable 12 cannot be lengthened due to dimensional restrictions in the height direction, the movable member return member 60
Is made of metal, and a sufficient re-press input (withstand load) can be obtained even with a thin plate thickness. Therefore, when the return member of the movable portion is used as compared with the case where only the turntable is used, the withstand load is increased.
There is a merit to do.

Even if the return member of the movable part is directly fixed to the shaft of the turntable, or if the return member of the movable part is directly fixed to the shaft of the motor, By changing the position of the return member in the axial direction of the shaft portion or the axial direction of the shaft, it is possible to adjust the magnitude of the supporting force applied to the movable portion by the support portion of the movable member in the return member. The spring force applied to the movable part can be set to an appropriate value depending on the mounting position of the return member of the movable part.

The present invention is not limited to the above embodiment. In the above-described embodiment, the disc-shaped information recording medium is, for example, an optical disc. However, the disc-shaped information recording medium is not limited to the optical disc, but may be a magneto-optical disc or another disc-shaped information recording medium. . Also, among the optical disks, compact disks (C
In addition to D), a CD-ROM (read-only compact disc), a CD-R (re-writable compact disc) or the like may be used.

[0057]

As described above, according to the present invention,
When the disc-shaped information recording medium is mounted on the turntable, the structure which can surely correct the eccentricity of the disc-shaped information recording medium can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optical disk device having a turntable of the present invention.

FIG. 2 is a sectional view showing a turntable and a motor of the optical disk device of FIG. 1;

FIG. 3 is an exploded perspective view showing a turntable, a return member of a movable unit, and a motor.

FIG. 4 is a cross-sectional view showing a turntable and a return member of a movable unit in FIG. 3;

FIG. 5 is a plan view of the turntable of FIG. 4;

FIG. 6 is a bottom view of the turntable of FIG. 4;

FIG. 7 is a plan view of a return member of the movable unit in FIG. 3;

FIG. 8 is a cross-sectional view showing another embodiment of the present invention.

FIG. 9 is a sectional view showing still another embodiment of the present invention.

FIG. 10 is a plan view of a movable member return member used in FIG. 9;

11 is a plan view of a movable member return member used in FIG. 9;

FIG. 12 is a cross-sectional view showing still another embodiment of the present invention.

FIG. 13 is a plan view of a movable member return member used in the turntable of FIG. 12;

FIG. 14 is an exploded perspective view showing still another embodiment of the present invention.

FIG. 15 is a sectional view showing the turntable and the like in FIG. 14;

FIG. 16 is a plan view of the turntable of FIG. 15;

FIG. 17 is a bottom view of the turntable of FIG. 15;

FIG. 18 is a plan view of a movable member return member used in FIG. 14;

FIG. 19 is a view showing that a return member of the movable portion serves as an assisting force at the time of centering.

FIG. 20 is a diagram showing an improvement in load resistance of the turntable.

FIG. 21 is a sectional view of a conventional turntable.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Optical disk apparatus, 12 ... Turntable, 14 ... Motor, 14A ... Motor shaft, 40 ... Centering part, 42 ... Shaft part, 4 ...
Reference numeral 8: fixed portion, 50: movable portion, 60: return member of the movable portion, D: optical disk (disk, disk-shaped information recording medium)

Claims (12)

[Claims] 1. A turntable for mounting and continuously rotating a disc-shaped information recording medium, comprising: a fixed portion fitted to an inner peripheral edge of a center hole of the disc-shaped information recording medium; A movable section for correcting eccentricity at the time of mounting the disc-shaped information recording medium by being fitted into the inner peripheral edge with respect to the section and elastically deforming, and formed integrally with the fixed section; A shaft portion into which a motor shaft for continuously rotating the turntable is inserted; and a position when the disc-shaped information recording medium is mounted when the disc-shaped information recording medium is not mounted. And a return member of a movable portion for returning to a position when the disc-shaped information recording medium is not mounted, wherein the return member of the movable portion is directly fixed to the shaft portion. Turntable characterized by Rukoto. 2. The turntable according to claim 1, wherein the movable section is a claw-shaped member, and a plurality of the movable sections are arranged at an equal angle about a rotation center axis. 3. A member for chucking the disk-shaped information recording medium, and a magnet for magnetically attracting the member for chucking, wherein the disk-shaped information recording medium includes the magnet and the magnet. The turntable according to claim 1, wherein the turntable is detachably held between members for chucking. 4. A turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein: a fixed portion fitted to an inner peripheral edge forming a center hole of the disc-shaped information recording medium; A movable part for correcting eccentricity at the time of mounting the disc-shaped information recording medium by being elastically deformed by being fitted into the inner peripheral edge with respect to the part, when the disc-shaped information recording medium is not mounted, A return member of a movable unit that returns the movable unit from a position where the disc-shaped information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted, and A hole for fitting a shaft of a motor for continuously rotating the turntable, and a return member of the movable portion is directly fixed to the shaft of the motor. Turntable, characterized in that. 5. The turntable according to claim 4, wherein said movable portion is a claw-shaped member, and a plurality of said movable portions are arranged at an equal angle around a rotation center axis. 6. A member for chucking the disk-shaped information recording medium, and a magnet for magnetically attracting the member for chucking, wherein the disk-shaped information recording medium includes the magnet and the magnet. 5. The turntable according to claim 4, wherein the turntable is detachably held between members for chucking. 7. An optical disc device having a turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein the turntable has an inner peripheral edge forming a center hole of the disc-shaped information recording medium. A movable part for correcting eccentricity when the disc-shaped information recording medium is mounted by being elastically deformed by being fitted to the inner peripheral edge with reference to the fixed part; A shaft portion into which a motor shaft for continuously rotating the turntable is inserted, and the movable portion is configured to record the disc-shaped information when the disc-shaped information recording medium is not mounted. A return member of a movable unit that returns from a position where a medium is mounted to a position where the disk-shaped information recording medium is not mounted, Return member of the dynamic part, an optical disk apparatus having a turntable, characterized in that it is directly fixed to the shaft portion. 8. The optical disk device having a turntable according to claim 7, wherein said movable portion is a claw-shaped member, and a plurality of said movable portions are arranged at an equal angle around a rotation center axis. 9. A member for chucking the disk-shaped information recording medium, and a magnet for magnetically attracting the member for chucking, wherein the disk-shaped information recording medium includes the magnet and the magnet. An optical disc device having a turntable according to claim 7, which is detachably held between members for chucking. 10. An optical disc device having a turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein the turntable has an inner peripheral edge forming a center hole of the disc-shaped information recording medium. A movable portion for correcting eccentricity at the time of mounting the disc-shaped information recording medium by being elastically deformed by being fitted to the inner peripheral edge with respect to the fixed portion; A return member of a movable section for returning the movable section from a position where the disc-shaped information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted when the information recording medium is not mounted. The fixed portion has a hole for fitting a shaft of a motor for continuously rotating the turntable, and the movable portion is returned. Wood is an optical disk apparatus having a turntable, characterized in that it is fixed directly to the shaft of the motor. 11. The optical disk device having a turntable according to claim 10, wherein said movable portion is a claw-shaped member, and a plurality of said movable portions are arranged at an equal angle around a rotation center axis. 12. A disc-shaped information recording medium, comprising: a member for chucking the disc-shaped information recording medium; and a magnet for magnetically attracting the chucked member. 11. A detachably held between members for chucking.
An optical disc device having the turntable according to claim 1.